LM2596SX-3.3/NOPB

ActiveVoltage Regulators - DC DC Switching RegulatorsDDPAK/TO-263

IC REG BUCK 3.3V 3A TO263-5

LM2596SX-3.3/NOPB is a 3.3V fixed output, 3A step-down DC-DC switching regulator with 150kHz switching frequency, in TO-263 package, featuring thermal shutdown and current limit protection.Checked against the datasheet

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Technical parameters

Key specs

Input voltage4.75 ~ 40 V

Output voltage3.168 ~ 3.432 VMax: 3.432 V (4.75 V ≤ VIN ≤ 40 V，0.2 A ≤ ILOAD ≤ 3 A，TJ = 25°C)，Max: 3.465 V (-40°C ≤ TJ ≤ 125°C)

Output current3 AMax

Switching frequency150 kHz

Datasheet-verified parameters

16 items

Parameter	Value and test conditions	Source
Output voltage	Min: 3.168 V, Typ: 3.3 V, Max: 3.432 V (4.75 V ≤ VIN ≤ 40 V, 0.2 A ≤ ILOAD ≤ 3 A, TJ = 25°C); Min: 3.135 V, Max: 3.465 V (-40°C ≤ TJ ≤ 125°C)
Input voltage range	4.75 V to 40 V (for 3.3-V version operation); Absolute Max: 45 V
Output current	3 A
Switching frequency	150 kHz
Package	DDPAK/TO-263 (KTT), 5 Pins
Operating temperature	-40°C to 125°C
RoHS	ROHS Exempt
Efficiency	Typ: 73% (VIN = 12 V, ILOAD = 3 A)
Quiescent current	Typ: 80 μA (Standby mode)
Maximum junction temperature	150 °C
Storage temperature	-65 °C to 150 °C
Feedback pin voltage	Min: -0.3 V, Max: 25 V
ON/OFF pin voltage	Max: 25 V (Shutdown threshold approx 1.3 V)
Protection features	Thermal shutdown and current-limit protection
MSL rating	Level-3-245C-168 HR
Pins	5

All parameters (21)ExpandCollapse

Power
Current - Output	3A
Voltage - Input (Max)	40V
Voltage - Input (Min)	4.5V
Voltage - Output (Max)	-
Voltage - Output (Min/Fixed)	3.3V
AC and DC characteristics
Frequency - Switching	150kHz
Environment and package
Mounting Type	Surface Mount
Operating Temperature	-40°C~125°C(TJ)
Package	Tape & Reel (TR); Cut Tape (CT); Digi-Reel®
Package / Case	TO-263-6, D²Pak (5 Leads + Tab), TO-263BA
Supplier Device Package	DDPAK/TO-263-5
Other
Base Product Number	LM2596
Function	Step-Down
Mfr	Texas Instruments
Number of Outputs	1
Output Configuration	Positive
Output Type	Fixed
Product Status	Active
Series	SIMPLE SWITCHER®
Synchronous Rectifier	No
Topology	Buck

Pinout and package

Figure 6-2. 5-Pin TO-263 KTT P… — Package: **DDPAK/TO-263 (KTT), 5 Pins**

Pin	Name	Function	Source
1		VIN, Positive input supply
2		Output, Internal switch output
3		Ground, Circuit ground
4		Feedback, Senses regulated output voltage
5		ON/OFF, Logic shutdown control

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DatasheetDatasheet · 4.9 MB · 2026-10-29

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